Brother DCP-J552DW Service Manual page 170

Document detection sensor PCB ASSY
(12) Reverse the ADF unit.
(13) Push the lock arm towards you, remove the rear end of the document detection sensor PCB
from the lock arm, and take out the document detection sensor PCB ASSY. Disconnect the
document detection sensor harness from the document detection sensor PCB.
Assembling Note Press down the document detection actuator and install the document detection
sensor PCB.
Document detection sensor PCB ASSY
Lock arm
(Rear)
3-53
Document detection sensor harness
Cable guide
ADF unit
(3_070)
Confidential